and in afghanistan a group of american soldiers took this day to re-enlist. general david petraeus is about to become the next cia director and was there to say good-bye and thanks. >> and america can never thank you enough. >> reporter: america's 235th birthday. a day to stand up and be proud. even if you're sitting down. brian mooar, nbc news, washington. >>> fox news is apologizing tonight for tweets saying president obama had been assassinated. the fox news politics account tweeted six reports that president obama had been shot and killed in iowa. but it was all a hoax. hackers broke into the account early this morning and sent out those tweets. fox news called them malicious and false, adding that it will work with twitter to figure out how the account was compromised. the secret service is also investigating. >>> as the rape case against dominique strauss-kahn in new york appears to be unfolding, a new allegation of rape is surfacing. a french novelist says the former imf chief tried to rape her in 2003 but she didn't report the crime because it could h